There are many websites，you can find almost all the necessary information.A. whereB. from

There are many websites， you can find almost all the necessary information.
A. where
B. from where
C. when
D. from when

A. where(答案→)B. from whereC. whenD. from when解析：考查从句，从句you can find almost all the necessary information不缺少成份，先行词是websites，是个非限制性定语从句，from where相当于which，所以选B，句子意思“这有许多网址，从这里你可以找到自己所需要的信息”

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